eugene f



E.- F. DAVENPORT.

SKIVING KNIFE. APPLICTION FILED JAN. 3l. 1919. I

- Patented N ov. 18, 1919.

i ,UNITED l STATESinail-EMTM OFFICE,

vEUGENE E. 'DAvENroRTmE MELRosE, MASSACHUSETTS, AssIGNoR To UNITED sHoE MACHINERY ooRroRATIoN, E PATERsoN, NEW, JERSEY, yA ooRroRATIoN 0E NEW To allwwmz't may concern: .Y :Beit known that YI, EUGENE FrDAvnN- PORT, a citizen ofthe United States, residing at Melrose, in the` countycf `Middlesex and State of Massachusetts, have invented certain new and useful Improvements. 1n ,Skiving-Knives; and I do herebydeclare the i Afollowing tobe a full, clear,pand; exact description of the invention, .such as. willenable others skilled inthe art to which 1t appertains tomake andnsethe same.

.\ The present invention relatestosklvlng i A fknives and more vparticularly 'to skiving knives which embody a flexible knife `blade held between a clampingnnember and a holder( l" s Skiving knives of the type disclosed inthe pending application, Latham, Serial No. .216,735,1`1ed February 12,1918, arefemployed to a wide extent for bevehngfand fsplittingsheet's of leather; gzAsjwillbe. obvions to those skillechin'thenart, thegknife bladejis'` ,advanced injthe holder` whenworn .away untilfthe greater portion'ogf thefiblade .has been used up, jatjwhichI time the' replacement ofthe `worn blade by ailcwj one is: easily effected. It is ,ofektreme importance lifn this vclass of knives {thatthe; ,cutting yedge shall rotate 'in ,a true circle 'without fthe 4:slightestdeviation.` `In frdel `o fopcratemost .elicentlaf .onthe work and: vvflthly this end; 1n view the clamping member is designed to causjeilall .portions of thegthirflexlble knife blade to conform accurately to the true cylindrical holder so that in operation the knife blade is held rigidly and may not distort or buckle in use. t

It is the object of the present 1nvent 1on to provide certain improvements 1n sklving knives of this type which shall in partlcular facilitate t-he clamping of the blade to the holder in such a manner that it may conform accurately throughout all portions to the shape of the holder and also permit the greatest possible portion of the kn1fe blade to be utilized before the blade is discarded.

With this object in view, the novel features of the invention consist in certain features of construction, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in theart from the following description. D

1 In the accompanying drawings lllustrat* ing the invention, Figure 1 represents a lonproj'ections which serve to connect the blade jratigve; to the ,ca'rrier; furthermore -the use `of the-lugs fpermits cfsubstantiallyal'l ofI the f sKrvINGKNIEE.'

, Specification of Lettersf'atent. p PatentdNoy, :1919,

Application nea January 31,1919. seriarNo; 274,291.

-gitudinalsection partly in elevation ofthe `accurate, conformation to the blade engaging vsurface of the holder. As'the entire blade Acould not be utilized this resulted with the -usualffornr of blade in rather frequent re- Vplacement'sif According to the-present invention the knife blade is provided, upon its `rear'edge, with a series of attaching lugs 'or with-thefcarriel. ,l These lugs areonly large enough to afford the desired connection with the bladenicarrier Hand permit more `or less -freedOI'nfOf distortion ofthe knife blade relknife blade to be effectivelyfutilized, andfin .consequence materially L increases the l life of `theblade prior to `discardlng.` 'e f Theifskiving knife shown in theiillustrated `embodimentof the invention ris similarfin yits general construction to` `that ydisclosed in thjefl-Latham fapplication above referred '.to.

Ati-blade.'iho'ldef"` lOvis; threaded-ly mounted upon a shaft 11 and isoprovided with anaccuratelyjinishedbladef engaging surface 12.

A flexible knife blade 14: is clampedfragainst clamping 'ring A15 which is secured to the hub 16 of a sleeve 17 journaled within the hollow knife shaft 11. The inner peripheral surface of the clamping ring 15 is tapered at 19 to engage with the correspondingly tapered face of an actuating member 2O rigidly connected to the end ofastem 21 sliding within the sleeve 17. The blade 14 is adjusted axially of the holder and clamping member by a carrier 23 which engages with thethreaded barrel 211 of the clamping ring 15. Upon releasing the clamping* ring through the rod 21 the knife blade may be advanced through a rotation of the ring 15 by the hollow sleeve 17 in a mannery well known to those skilled in the art. As has been stated heretofore, it is of eXtreme importance in this class cof constructions that the knife blade when clamped within the holder shall conform accurately to a true cylinder and in order to attain this end it is necessary to design the knife blade insuch a manner that it 'may freely conform to all portions of the blade engaging surface of the holder when the clamping ring is expanded. As shown in the drawings, more particularly Fig. 2, the knife blade comprises a thin band of tempered steel bent or formed into approximately the shape of a cylinder. One edge of the blade is beveled off in the usual manner to form the cutting edge and the opposite edge of the blade is cut away to form a series of spaced attaching lugs or projections 25 having their outer surfaces flush with the outer periphery of the blade and of sulicient width to properly connect the blade to the carrier without interfering with the clamping of the blade to the holder by the clamping ring. As will be Observed from the drawings, each of the lugs 25 is provided with a teat 27 received `in an annular groove 29 formed in the carrier 23. As will be observed from an inspection of Fig. l, the body of the knife blade is Out of contact with the carrier and the only connection between the blade and carrier is that a'orded by the spaced lugs 25. Vith this construction substantially the entire knife blade may be utilized and as the lugs 25 are annealed to make them softer than the body port-ion of the blade a considerable distortion of the blade and lugs is permitted without tending to buckle or bend the knife blade as a whole.

Vhile it is preferred to employ the specie construction and arrangement of parts shown and described, it will be understood that this construction and arrangement is not essential except so far as specified in the claims, and may be changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is:

l. A skiving knife comprising a blade holder, a clamping member, a blade carrier adjustable axially of the holder and clamping member and a tubular knife blade adapted to be clamped between the holder and clamping member and having a series of separated integral lugs projecting from thel separated lugs projecting from the rear edge and provided with integral teats received in the recess to connect the blade to the carrier.

d. A skiving knife comprising a blade holder, a clamping member, a blade carrier adjustable axially of the holder and a tubular knife blade of substantial width having a cutting edge formed on one end and having a series of separated lugs on the opposite end to connect the blade with the carrier.

5. A skiving knife comprising an external holder, a clamping member, a blade carrier adjustable axially of the holder and having an annular recess formed therein and a tubular knife blade adapted to be clamped between the holder and clamping member having a series of separated lugs projecting from the rear edge with their outer peripheral surfaces flush with the outer surface of the blade and each lug provided with an inwardly projecting teat received in the recess.

EUGENE F. DAVENPORT. 

